CN104914560B - A kind of big depth of field endoscope lens in big visual field - Google Patents
A kind of big depth of field endoscope lens in big visual field Download PDFInfo
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- CN104914560B CN104914560B CN201510268868.4A CN201510268868A CN104914560B CN 104914560 B CN104914560 B CN 104914560B CN 201510268868 A CN201510268868 A CN 201510268868A CN 104914560 B CN104914560 B CN 104914560B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
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- Optics & Photonics (AREA)
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Abstract
The invention provides a kind of big big depth of field endoscope lens in visual field, including front lens group and rear lens group, aperture diaphragm is provided between the front lens group and rear lens group, the front lens group by two negative lens groups into, the rear lens group is by three positive lens groups into the ratio between focal length of the preceding group lens group and rear group lens group forms anti-long distance system between 0.4~0.2, visual field is increased, full filed reaches 110 degree.Meanwhile, the entrance pupil of the big depth of field endoscope lens in big visual field of the invention is added into interpupillary distance, therefore effectively increase the depth of field while clear aperature is ensured away from and positioned at after object plane.The rear lens group meets image space telecentric system with front lens group, and illuminance uniformity is high, can well be coupled with fibre system, and reach diffraction limit in alignment surface (object plane).
Description
Technical field
It is especially a kind of that there is big visual field, the big depth of field and Entry pupil diameters are taken into account simultaneously the present invention relates to field of optical lens
Endoscope lens.
Background technology
Existing fujinon electronic video endoscope is generally all that it has figure as photographing element using miniature image sensor such as CCD
As high resolution, definition is good the advantages of.In recent years, as miniature CCD is widely used and rapidly develops, for
The requirement for the fujinon electronic video endoscope that CCD matches also more and more higher.Under normal circumstances, it is desirable to endoscope lens have high-resolution and
The larger angle of visual field and the depth of field, and the good ability for correcting various differences.
United States Patent (USP) US005936778A discloses a kind of negative focal length type endoscope lens, and group concavees lens system is by two before it
Individual concavees lens composition, both ensure that back focal length degree, aberration during amplification can be preferably corrected again.Four groups of camera lenses are configured with five altogether
Lens, including preceding group of concavees lens being made up of two concavees lens L1 and L2, the rear convex systems being made up of camera lens L3 and L5
And the aperture diaphragm being inserted, it is ensured that focus is at least three times of whole system composite focus after long.Peeped in this patent
Endoscope objective lenses, with larger visual field, but during for fibre opic endoscope front end, still there is weak point, such as its depth of field is smaller, peeps inside
Lens head is difficult to observe whole cavity when entering renal plevis etc..Meanwhile, the coupling effect of this object lens and optical fiber is poor, and illumination is not
It is enough uniform, it is unsuitable for using in endoscope optical fiber front end.
The content of the invention
The present invention is for of the prior art not enough there is provided a kind of big big depth of field endoscope lens in visual field, with larger
Visual field, and the depth of field, uniform-illumination are added on the premise of clear aperature is not reduced, and can preferably be coupled with optical fiber.
In order to solve the above-mentioned technical problem, the present invention is addressed by following technical proposals：
A kind of big depth of field endoscope lens in big visual field, including front lens group and rear lens group, the front lens group and it is rear thoroughly
Be provided with aperture diaphragm between microscope group, the front lens group by negative lens group into, the rear lens group by positive lens groups into；Before described
The ratio between focal length of group lens group and rear group lens group is between -0.4~-0.2.
As the further improvement of above-mentioned technical proposal, the front lens group includes the first lens and the second lens, described
First lens are plano-concave lens, and the second lens are bent moon negative lens, the ratio between the focal length of first lens and the second lens between
Between 0.5~1.5.
It is preferred that, the focal length of described front lens group is negative, and full filed is 110 degree.
It is preferred that, the nearly object plane of first lens is plane, and optical material requires n1>1.7,V1>40.
As the further improvement of above-mentioned technical proposal, the rear lens group includes the 3rd lens, the 4th lens, the 5th saturating
Three pieces of positive lens of mirror, the rear lens group constitutes anti-long distance system with the front lens group.
It is preferred that, the 4th lens in the rear lens group are formed by a positive lens and a negative lens gluing, glass material
Meet positive lens refractive index less than negative lens refractive index, meet normal glued.
It is preferred that, the 3rd lens and the 5th lens in the rear lens group are biconvex lens.
As the further improvement of above-mentioned technical proposal, the endoscope lens meet telecentric beam path in image space, each visual field light
Line chief ray angle after the refraction of the 5th lens is 0.
As the further improvement of above-mentioned technical proposal, the endoscope lens depth of field can cover 0.5 times of object distance to 12 times
Object distance.
As the further improvement of above-mentioned technical proposal, the endoscope lens object distance is 4.2mm, and field depth is 2mm-
50mm。
The big depth of field endoscope lens in big visual field of the present invention, the first lens of its front lens group and second lens are all
Negative focal length lens, so as to constitute anti-long distance system with rear group lens, increase visual field, its full filed is reached 110 degree.Meanwhile,
The entrance pupil of the endoscope lens of the present invention is added into interpupillary distance, therefore ensureing light hole away from and positioned at after alignment object plane
The depth of field is effectively increased while footpath, its depth of field can cover 0.5 times of object distance to 12 times of object distances.It is preferred that, when its object distance is
During 4.2mm, field depth is 2mm-50mm.Further, endoscope lens of the invention, the rear lens group and front lens group
Image space telecentric system is met, each field rays chief ray angle after the refraction of the 5th lens is 0, and illuminance uniformity is high, and
Can well it be coupled with fibre system.
The big depth of field endoscope lens in big visual field of the present invention, it is adaptable to fibre opic endoscope camera lens, the depth of field big with visual field
Greatly, illuminance uniformity is good and the advantage that can preferably be coupled with fibre system, is used as endoscope lens entering the cavity in human body
During such as renal plevis, with more preferable observing effect, the diagnosis and treatment of illness are greatly facilitated.
Brief description of the drawings
Fig. 1 is the optical arrangement figure of the big depth of field endoscope lens in big visual field in one embodiment of the present of invention；
Fig. 2 propagates schematic diagram for the light of the endoscope lens in Fig. 1 embodiments；
Imaging effect figures one of the Fig. 3 for the endoscope lens in Fig. 1 embodiments in the case where reference material is away from 4.2mm；
Imaging effect figures two of the Fig. 4 for the endoscope lens in Fig. 1 embodiments in the case where reference material is away from 4.2mm；
Imaging effect figures one of the Fig. 5 for the endoscope lens in Fig. 1 embodiments in the case where reference material is away from 50mm；
Imaging effect figures two of the Fig. 6 for the endoscope lens in Fig. 1 embodiments in the case where reference material is away from 50mm；
Imaging effect figures one of the Fig. 7 for the endoscope lens in Fig. 1 embodiments in the case where reference material is away from 2mm；
Imaging effect figures two of the Fig. 8 for the endoscope lens in Fig. 1 embodiments in the case where reference material is away from 2mm；
Description of reference numerals：The lens of 1- first, the lens of 2- second, 3- aperture diaphragms, the lens of 4- the 3rd, the lens of 5- the 4th
Positive lens, the negative lens of the lens of 6- the 4th；The lens of 7- the 5th；The lens of r1- first enter smooth surface, r2- the first lens exiting surfaces, r3-
Second lens enter smooth surface, and r4- the second lens exiting surfaces, the lens of r5- the 3rd enter smooth surface, the lens exiting surfaces of r6- the 3rd, r7- the 4th
The positive lens of lens enters smooth surface, and the positive lens exiting surface of the lens of r8- the 4th, the negative lens of the lens of r9- the 4th enters smooth surface, r10-
Four saturating negative lens exiting surfaces, the lens of r11- the 5th enter smooth surface, the lens exiting surfaces of r12- the 5th.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
In the preferred embodiment of the present invention, a kind of big big depth of field endoscope lens in visual field, including including front lens
Group and rear lens group, are provided with aperture diaphragm between the front lens group and rear lens group；The front lens group by negative lens group into,
The rear lens group by positive lens groups into；Before described the ratio between group lens group and focal length of rear group lens group between -0.4~-0.2 it
Between.Using such a design, front lens group and rear lens group constitute anti-long distance system, increase visual field, make its angle of visual field more than 90
Degree, so as to when it enters the cavity such as renal plevis in human body, with more preferable observing effect, facilitate the diagnosis of illness and control
Treat.
Based on the structure of above-mentioned endoscope lens, as shown in attached body 1, in the present embodiment, the front lens group includes the
One lens 1 and the second lens 2, wherein the first lens 1 are plano-concave lens, the second lens 2 are bent moon negative lens, the first lens and the
The ratio between focal length of two lens is between 0.5~1.5.Meanwhile, entrance pupil adds entrance pupil away from and positioned at after alignment object plane
Away from, and increase the depth of field while clear aperature is ensured.In the present embodiment, the big depth of field endoscope thing in big visual field of the invention
The mirror depth of field can cover 0.5 times of object distance to 12 times of object distances.It is preferred that, when object distance is 4.2mm, field depth is 2mm-50mm, full
Observation when foot enters cavity such as renal plevis etc. of human body is required.
Particularly, the nearly object plane r1 of first lens 1 is plane, and optical material requires n1>1.7,V1>40, meet
The use requirement of endoscope lens.
Further, in the present embodiment, the rear lens group includes the 3rd lens 4, the 4th lens and the 5th lens 7 three
Block positive lens, it is preferred that wherein the 4th lens are formed by the gluing of negative lens 6 of the lens of positive lens 5 and the 4th of the 4th lens, and
Glass material meets positive lens refractive index less than negative lens refractive index, meets normal glued；3rd lens 4 and the 5th lens 7 are
Biconvex lens, wherein the nearly image planes of the 5th lens 7 are exiting surface.Using such a design, the rear lens group and front lens group structure
Into anti-long distance system, the whole city of the endoscope lens in the present embodiment is set to have reached 110 degree.
Further, the endoscope lens in the present embodiment, rear lens group meets image space telecentric system with front lens group, such as
Shown in Fig. 2, each field rays chief ray angle after the refraction of the 5th lens is 0, and illuminance uniformity is high, and can be with optical fiber system
System coupling well.
Endoscope lens in the present embodiment, structural parameters are as follows：
| Lens radius curvature (r) | Thickness (d) | Refractive index (Nd) | Abbe constant (Vd) |
| R1 is infinitely great | 0.1000 | 1.88 | 41.0 |
| r2 0.3724 | 0.2012 | ||
| r3 1.8656 | 0.6709 | 1.53 | 76.9 |
| r4 2.2808 | 0.3216 | ||
| R5 is infinitely great | 0.0632 | ||
| r6 1.8555 | 0.0986 | 1.62 | 60.3 |
| r7 -0.9037 | 0.1002 | ||
| r8 1.2383 | 0.9544 | 1.60 | 53.6 |
| r9 -0.3744 | 0.1000 | 1.85 | 23.8 |
| r10 -5.9239 | 0.5930 | ||
| r11 6.0000 | 0.2400 | 1.53 | 76.9 |
| r12 -0.8837 | 0.2940 |
Using said structure parameter, the big depth of field endoscope lens in big visual field in the present embodiment, its visual field is 110 degree, hole
Footpath 0.9mm, Entry pupil diameters 0.1mm, reference material can cover 2-50mm away from 4.2mm, the depth of field, can be derived that as shown in figures 3-8 interior
Sight glass object lens are in reference material away from the image quality at 2mm to 50mm.
It can be seen that reference material is away under 4.2mm, maximum field of view's hot spot RMS radiuses are 0.42um, reach diffraction limit,
Much smaller than two pixel (i.e. two optical fiber) sizes；MTF is more than 0.4 at 160lp/mm.
It is the trend that the image quality at 50mm is not decreased obviously in object distance, maximum field of view's hot spot RMS radiuses are
4.2um, less than two pixel (two optical fiber) sizes, meets resolution requirement；MTF is more than 0.15 at 160lp/mm, meets
Imaging requirements.
It is that at 2mm, maximum hot spot RMS radiuses are 3.5um in object distance, less than two pixel (two optical fiber) sizes are met
Resolution requirement；MTF is more than 0.15 at 160lp/mm, meets imaging requirements.
In a word, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in the present invention
Spirit and principle within any modifications, equivalent substitutions and improvements for being made etc., should be included in protection scope of the present invention it
It is interior.
Claims (8)
1. a kind of big depth of field endoscope lens in big visual field, it is characterised in that：Including front lens group and rear lens group, the front lens
Be provided with aperture diaphragm between group and rear lens group, the front lens group by negative lens group into, including the first lens and the second lens,
First lens are plano-concave lens, and nearly object plane is plane, and optical material requires 1.88 >=n1 ＞ 1.7, and the second lens are curved
Month negative lens, and two spheres all bend towards aperture diaphragm；The rear lens group is by positive lens groups into including the 3rd lens, the 4th
Lens, three pieces of positive lens of the 5th lens, and last a piece of positive lens is close to image planes, the rear lens group and the front lens group structure
Into anti-long distance system；The ratio between focal length of the front lens group and rear lens group is between -0.4~-0.2.
2. the big depth of field endoscope lens in big visual field as claimed in claim 1, it is characterised in that：, first lens and second
The ratio between focal length of lens is between 0.5~1.5.
3. the big depth of field endoscope lens in big visual field as claimed in claim 2, it is characterised in that：The focal length of described front lens group
It is negative, full filed is 110 degree.
4. the big depth of field endoscope lens in big visual field as claimed in claim 1, it is characterised in that：The 4th in the rear lens group
Lens are formed by a positive lens and a negative lens gluing, and glass material meets positive lens refractive index less than negative lens refractive index.
5. the big depth of field endoscope lens in big visual field as claimed in claim 1, it is characterised in that：The 3rd in the rear lens group
Lens and the 5th lens are biconvex lens.
6. the big depth of field endoscope lens in big visual field as described in claim any one of 1-5, it is characterised in that：Meet image space telecentricity
Light path, each field rays chief ray angle after the refraction of the 5th lens is 0.
7. the big depth of field endoscope lens in big visual field as claimed in claim 6, it is characterised in that：The depth of field can cover 0.5 times of object distance
To 12 times of object distances.
8. the big depth of field endoscope lens in big visual field as claimed in claim 7, it is characterised in that：Object distance is 4.2mm, field depth
For 2mm-50mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510268868.4A CN104914560B (en) | 2015-05-22 | 2015-05-22 | A kind of big depth of field endoscope lens in big visual field |
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| CN201510268868.4A CN104914560B (en) | 2015-05-22 | 2015-05-22 | A kind of big depth of field endoscope lens in big visual field |
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| CN104914560A CN104914560A (en) | 2015-09-16 |
| CN104914560B true CN104914560B (en) | 2017-09-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU211129U1 (en) * | 2021-11-15 | 2022-05-23 | Общество с ограниченной ответственностью "ФИЗИКА КОСМЕТОЛОГИИ" | LENS |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105662315A (en) * | 2015-12-31 | 2016-06-15 | 天津市融和机电科技有限公司 | High-resolution breast duct endoscope optical system |
| CN107260108A (en) * | 2017-06-27 | 2017-10-20 | 苏州奥特科然医疗科技有限公司 | A kind of ultrathin optical system and the endoscope with the optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU211129U1 (en) * | 2021-11-15 | 2022-05-23 | Общество с ограниченной ответственностью "ФИЗИКА КОСМЕТОЛОГИИ" | LENS |
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Effective date of registration: 20180213 Address after: Hangzhou City, Zhejiang province 311199 City District of Yuhang economic and Technological Development Zone Yuhang Road No. 22 401B Patentee after: Hangzhou is without wound Photoelectric Co., Ltd. Address before: 311100 room 702, Yongan mansion, No. 355, Nanyuan street, Nanyuan street, Yuhang District, Zhejiang Patentee before: Yao Peng |
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Denomination of invention: An endoscope objective with large field and depth of field Effective date of registration: 20210118 Granted publication date: 20170919 Pledgee: Hangzhou High-tech Financing Guarantee Co.,Ltd. Pledgor: HANGZHOU WUCHUANG PHOTOELECTRIC Co.,Ltd. Registration number: Y2021330000040 |